In this lecture, we study Elastic Deformation, Plastic Deformation And Elastic Limit from the Physics class 11 chapter 5 new book of Punjab Boards under the topic Solids and Fluid Dynamics. The concept of stress strain curve class 11 Physics is explained in depth using clear graphs and examples. We discuss the elastic and plastic deformation graph step by step, describing regions of proportionality, yield point, and breaking point to help students visualize real material behavior. The stress strain curve for ductile material is also analyzed in detail, highlighting differences between elastic and plastic regions. ð These concepts are also included in AP Physics, IB Physics, and Cambridge A-Level Physics courses and are widely applied in engineering, robotics, and AI material simulations. Link to all lectures of 11 class Physics new book Punjab boards:    âĒ Class 11 Physics New Book Punjab boards  Physics class 11 Chapter 5 Solids and Fluid Dynamics all lectures:    âĒ Solids and Fluid Dynamics | Physics Class ... Â